eberhard



3 Sheets-Sheet 1. A. EBERHARD.

STEAM ENGINE (No Model.)

No. 290,871 Pa tented Dec. 25, 1883.

INVENTOB WITNESSES ATTORNEYS.

(No Model.)

3 Sheets-Sheet 2. A. EBERHARD.

STEAM ENGINE No. 290.871.

Patented Deg. 25, 1883.

WITNESSES ATTORNB Nrrnn STATES PATENT Urrrcn.

ANTON EBERHARD, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 290,871, dated December25, 1883.

. Application filed July 20, 1883. (No model.)

To aZZ whom it may concern Be it known that I, ANTON EBERHABD, of thecity and county of Philadelphia, and State of Pennsylvania, haveinvented certain new and useful Improvements in Steam-Engines, of whichthe following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1, Sheet 1, is a plan view of my improvement, parts being brokenaway. Fig. 2, Sheet 2, is a sectional side elevation of the same, takenthrough the broken line 00 w x 0000, Fig. 1. Fig. 3. Sheet 2, is a planview of a part of one of the cross-heads. Fig. 4, Sheet 3, is asectional end elevation of the improvement, taken through the brokenline 3 y 3 Fig. 1. Fig. 5, Sheet 3, is a sectional plan view of thesteam-cylinders, showing the pistons, piston-rods, and piston-rod leversin plan view.

The object of this invention is to promote efliciency and economy in theuse of steam.

The invention consists in a steam-engine constructed with two cylinderscurved upon the arc of a circle, and having four pistons connected inpairs by curved piston-rods connected by levers with the slotted lugs ofcrossheads provided with pivot-arms carrying the inner ends of pitmen,the outer ends of which are connected by crank-pins with the flywheelsof the drive-shaft.

With the inlet and outlet ports of the two curved cylinders and thedrive-shaft are connected four valves, which are connected in pairs byvalve-rods, and the said valve-rods are connected with each other andwith the drive-shaft by gear-wheels, whereby the said valves will beopened and closed automatically and at the proper times, as will behereinafter fully described.

A A are two steam-cylinders, which are,

er supports, B B, secured to the bed-plate or base 0 of the machine. Thecylinders A A are open at both ends, and have inlet-ports D D in thecenters of their upper sides, and outletports E E in the centers oftheir lower sides. The inlet-ports D D are connected with the ends ofthe branches F F of the inlet steampipe G, and the outlet-ports E E areconnect ed with the outlet steam-pipes H H.

WVithin each of the cylinders A A are placed two pistons, I I. Thecorresponding pistons of the two cylinders are connected by piston-rodsJ J, which are curved upon the arc of the circle of which the saidcylinders form a part, so that the pistons of the two cylinders willalways move in opposite directions.

' To the centers of the curved piston-rods J J are bolted the outer endsof two levers, K K, the inner ends of which are halved to each other,and are pivoted to a bolt, L, formed upon or attached to the upper endof the standard M. The lower end of the standard M is secured to thebase 0 in the center of the circle of which the cylinders A A form apart. The middle parts of the levers K K are thickened, and have holesformed through them to serve as bearings for the pivots N N, which aresecured in place by washers and nuts applied to their lower ends. Theupper parts of the pivots N N are squared, pass through slots in thelugs O 0, formed upon the inner sides of the centers of the slides orcrossheads P P, and have washers and nuts applied to their upper ends.By this construction the cross-heads P P will be moved back and forth instraight lines by the movements of the levers K K through the arcs ofcircles. The sides of the slots in the lugs O O are faced withbearing-plates Q Q,to lessen the friction, and which are held up againstthe squared upper parts of the pivots N N by set-screws B B, so that thewear can be readily taken up. The end parts of the slides Pl slide inbearings S S, attached to the ends of the cylinders A A or othersuitable supports, and which are provided with fricti0n-p1ates Z, heldforward against the said slides]? by set-screwsm.

Upon the upper parts of the slides P 1?,directly opposite the lugs O O,are formed outwardly-proj ecting arms T T, to the outer ends of whichare pivoted the ends of the pit-men U U. The other ends of the pitrnen UU are pivoted to crank pins V V, attached to the fiy-wheels \V \V,secured to shaft X, which revolves in bearings in supports Y, attachedto the base 0. The fly-wheels XV W may be made with fiat faces toreceive belts for giving motion to the machinery to be driven; or powermay be taken from the engine by means of a pulley or gear-wheel attached to the shaft X, as indicated in dotted lines in Fig. 1.

To the shaft X is attached a small beveledgear wheel, Z, the teeth ofwhich mesh into the teeth of a larger gear-wheel, a, attached to theouter end of the valve-rod b. The inner end of the valve-rod Z2 isconnected with the inner end of the valve-rod b by sleeves c, set-screwsd, and a connecting-rod, c, or other suitable couplings.

Upon the parts of the valve-rods Z) bthat pass through the steam-inletpipes F F are formed, or to them are attached, valve-plugs ff, the portsof which are at right angles with each other, as shown in Fig. 2, sothat steam will be admitted into the cylinders A A alternately, or twiceto each cylinder during each revolution of the valve-rods b b.

' To the outer part of the valve-rod b is attached a gear-wheel, g, theteeth of which mesh into the teeth of the gearwheel 9, attached to theouter part of the valve-rod h. The gearwheels 9 g are of equal size, sothat the two sets of valve-rods will be revolved at equal speed. Theinner end of the valve-rod h is connected by a sleeve, 1', andset-screws j with the inner end of the corresponding Valve-rod, h.

Uponthe parts of the valve-rods h it that pass through the steanroutletpipes H Hare formed, or to them are attached, valve-plugs 7c, the portsof which are at right angles with each other and with the ports of theircorresponding inlet-valve plugs, f f, as shown in Fig. 2. With thisarrangement, as the inlet-valve of each cylinder is opened, theoutlet-valve of the said cylinder will be closed, and the othercylinderwill have its inlet-valve closed and its outlet-valve opened, sothat as steam is received into one cylinder it will be exhausted fromthe other.

I do not abandon or dedicate to the public any patentable feature setforth herein and not hereinafter claimed, but reserve the right to claimthe same either in a reissue of any patent that may be granted upon thisapplication or in other applications for Letters Patent that I may make.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A steam-engine constructed substantially ashereinshown and described, and consisting of two cylinders curved upon the areof a circle, and four pistons connected in pairs by curved pistonrodsconnected by levers with slotted lugs of cross-heads provided with armscarrying the inner ends of pitmen, the outer ends of which areconnected. by crank-pins with the fly-wheels of the drive-shaft, as setforth.

2. In a steam-engine, the combination,with the curved cylinders A A, thecurved pistonrods J J, and the pitmen U U, connected with thedrive-shaft X by the crank-pins V V and fly-wheels WV W, of the levers KK and the cross-heads P I having slotted lugs O O and pivot-arms T T,substantially as herein shown and described, whereby the reciprocatingmotion of the piston-rods is changed into rotary motion, as set forth.

3. In a steam-engine, the combinatiomwith the curved cylinders A A, theinlet-ports D D, the outlet-ports E E, and the drive-shaft X, of thevalves ff 7c 70, the valve-rods b b h h, and the gear-wheels g g a Z,substantially as herein shown and described, whereby the valves will beopened and closed automatically and at the proper times, as set forth.

4. The cross-heads P 1?, having slotted lugs O O on the inner sides oftheir centers, in combination with the pivots N N, squared at theirupper ends and passing through said slots, and the levers K K, providedwith mid dle bearings for said pivots,whereby the cross heads may alwaysmove in straight lines, as described.

ANTON EBERHARD.

Vitnesses:

J osEPH F. MARCER, JACOB MoRLoK.

